Explanation:
I can't get your question ,but if you are asking for the equation of a line with the coordinates (7,3) and gradient m = -2
we use the expression
y-y1 =m (x-x1)
substitute the y1 and x1 coordinates and gradient in the formula
y -3 = -2 (x-7 )
y-2 = -2x +14
y=-2x+14+2
y=-2x+16
rearranging
2x+y-16=0
therefore the equation of that line is
2x +y -16 =0